Add parameter to PropertyEditor to allow custom BeanBlockSource to be used in place of the default one

Details

Description

I am building a search form and would like to override the default edit blocks with search-style ones. This is conjunction with a HashMap<String, Object> backed bean model. As an example, for dates I want to have a date range block which sends back a start/end range for a date, possibly as a DateRangeSearchTerm against the property name in the hashmap. The search implementation will then know how to convert this into a query to the backend.

I might be pushing the whole BeanEditModel/Conduit framework further than intended? However, doing it this way provides some nice ways to override an auto-built form, eg. by restricting/reordering the properties or by overriding specific blocks even further.